Enable tab-bar-mode from X resources

* lisp/startup.el (x-apply-session-resources): Enable tab-bar-mode
when X resource "tabBar" class "TabBar" is "on", "yes" or "1".

* doc/man/emacs.1.in:
* doc/emacs/xresources.texi (Table of Resources):
Document X resource "tabBar" (class "TabBar").

4 files changed, 14 insertions, 6 deletions

diff --git a/doc/emacs/cmdargs.texi b/doc/emacs/cmdargs.texi
index 2b403b4a33e..fa28c3eabcb 100644
--- a/doc/emacs/cmdargs.texi
+++ b/doc/emacs/cmdargs.texi
@@ -1237,9 +1237,9 @@ Disable the blinking cursor on graphical displays.
 @opindex -D
 @itemx --basic-display
 @opindex --basic-display
-Disable the menu-bar, the tool-bar, the scroll-bars, and tool tips,
-and turn off the blinking cursor.  This can be useful for making a
-test case that simplifies debugging of display problems.
+Disable the menu-bar, the tool-bar, the scroll-bars, tool tips, and
+font-lock-mode, and turn off the blinking cursor.  This can be useful
+for making a test case that simplifies debugging of display problems.
 @end table
 
   The @samp{--xrm} option (@pxref{Resources}) specifies additional
diff --git a/doc/emacs/xresources.texi b/doc/emacs/xresources.texi
index d8b70ef9009..e349d40333f 100644
--- a/doc/emacs/xresources.texi
+++ b/doc/emacs/xresources.texi
@@ -319,6 +319,11 @@ Name to display in the title bar of the initial Emacs frame.
 If the value of this resource is @samp{off} or @samp{false} or
 @samp{0}, Emacs disables Tool Bar mode at startup (@pxref{Tool Bars}).
 
+@item @code{tabBar} (class @code{TabBar})
+@cindex tab bar
+If the value of this resource is @samp{on} or @samp{yes} or
+@samp{1}, Emacs enables Tab Bar mode at startup (@pxref{Tab Bars}).
+
 @item @code{useXIM} (class @code{UseXIM})
 @cindex XIM
 @cindex X input methods
diff --git a/doc/lispref/internals.texi b/doc/lispref/internals.texi
index ab385168af2..e9fcbf48cb4 100644
--- a/doc/lispref/internals.texi
+++ b/doc/lispref/internals.texi
@@ -2324,8 +2324,8 @@ minibuffer or the echo area.
 Non-zero if this window is a @dfn{pseudo window}.  A pseudo window is
 either a window used to display the menu bar or the tool bar (when
 Emacs uses toolkits that don't display their own menu bar and tool
-bar) or a window showing a tooltip on a tooltip frame.  Pseudo windows
-are in general not accessible from Lisp code.
+bar) or the tab bar or a window showing a tooltip on a tooltip frame.
+Pseudo windows are in general not accessible from Lisp code.
 
 @item parent
 Internally, Emacs arranges windows in a tree; each group of siblings
diff --git a/doc/man/emacs.1.in b/doc/man/emacs.1.in
index 25c32e018a0..5fe12aed95d 100644
--- a/doc/man/emacs.1.in
+++ b/doc/man/emacs.1.in
@@ -284,7 +284,7 @@ frames is a width of 80 and a height between 35 and 40, depending on
 the OS and the window manager.
 See the Emacs manual, section "Options for Window Size and Position",
 for information on how window sizes interact
-with selecting or deselecting the tool bar and menu bar.
+with selecting or deselecting the tool bar, tab bar and menu bar.
 .TP
 .BI \-lsp " pixels\fR,\fP " \-\-line\-spacing= "pixels"
 Additional space to put between lines.
@@ -517,6 +517,9 @@ window.
 .BR toolBar " (class " ToolBar )
 Number of lines to reserve for the tool bar.
 .TP
+.BR tabBar " (class " TabBar )
+Number of lines to reserve for the tab bar.
+.TP
 .BR useXIM " (class " UseXIM )
 Turns off use of X input methods (XIM) if
 .I false